CN113119770A - Charging and battery replacing system - Google Patents

Charging and battery replacing system Download PDF

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Publication number
CN113119770A
CN113119770A CN202110418730.3A CN202110418730A CN113119770A CN 113119770 A CN113119770 A CN 113119770A CN 202110418730 A CN202110418730 A CN 202110418730A CN 113119770 A CN113119770 A CN 113119770A
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CN
China
Prior art keywords
battery
energy storage
unit
power
storage battery
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110418730.3A
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Chinese (zh)
Inventor
张华建
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Zhejiang Ying Fei Amperex Technology Ltd
Inventronics Hangzhou Co Ltd
Original Assignee
Zhejiang Ying Fei Amperex Technology Ltd
Inventronics Hangzhou Co Ltd
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Application filed by Zhejiang Ying Fei Amperex Technology Ltd, Inventronics Hangzhou Co Ltd filed Critical Zhejiang Ying Fei Amperex Technology Ltd
Priority to CN202110418730.3A priority Critical patent/CN113119770A/en
Publication of CN113119770A publication Critical patent/CN113119770A/en
Pending legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/30—Constructional details of charging stations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/50—Charging stations characterised by energy-storage or power-generation means
    • B60L53/53—Batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/60—Monitoring or controlling charging stations
    • B60L53/63—Monitoring or controlling charging stations in response to network capacity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/80—Exchanging energy storage elements, e.g. removable batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/30—AC to DC converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/12—Electric charging stations

Abstract

The application discloses fill and trade electric system, including the AC/DC conversion unit who is connected with the electric wire netting, the switch unit who is connected with AC/DC conversion unit, the energy storage battery who is connected with the switch unit, variable unit, DC/DC conversion unit and the control unit. The variable unit can be filled with a battery pack of an energy storage battery or a battery pack of a power battery, the control unit is used for controlling the power grid to charge the energy storage battery and the variable unit under the condition of a valley power time period, controlling the variable unit to charge the power battery under the condition of a non-valley power time period, and controlling the energy storage battery to charge the power battery after a preset time length. The variable unit can be used as an energy storage battery to charge and discharge, and also can be used as a power battery to charge, so that when the variable unit is used as the energy storage battery, the storage efficiency of the battery charging and replacing system in the process of storing electric quantity is improved, the cost of the battery charging and replacing system is reduced, and the flexibility of the battery charging and replacing system is improved.

Description

Charging and battery replacing system
Technical Field
The application relates to the technical field of power electronics, in particular to a battery charging and replacing system.
Background
With the development of science and technology, new energy electric vehicles are becoming the key points of the automobile industry and energy development gradually as a model for the use of clean energy, and also becoming more important components in human daily life gradually.
At present, a charging and replacing system for supplying power to a new energy electric vehicle mainly charges an energy storage battery by depending on electric energy of a power grid, and then charges the new energy electric vehicle by the energy storage battery. When the energy storage battery cannot meet the charging requirement of the new energy electric vehicle, the capacity of the energy storage battery needs to be enlarged, so that the whole energy storage battery of the battery charging and replacing system needs to be replaced, and the cost of the battery charging and replacing system is increased.
Therefore, how to reduce the cost of the battery charging and replacing system is an urgent problem to be solved by those skilled in the art.
Disclosure of Invention
The application aims to provide a battery charging and replacing system for reducing the cost of the battery charging and replacing system.
In order to solve the above technical problem, the present application provides a charging and battery replacing system, including: the system comprises an AC/DC conversion unit connected with a power grid, a switch unit connected with the AC/DC conversion unit, an energy storage battery connected with the switch unit, a variable unit, a DC/DC conversion unit and a control unit;
the control unit is used for controlling the switch unit to enable a power grid to respectively charge the variable unit and the energy storage battery through the AC/DC conversion unit under the condition of a valley power time period, controlling the switch unit to enable the variable unit to charge the power battery through the DC/DC conversion unit under the condition of a non-valley power time period, delaying for a preset time, and controlling the energy storage battery to charge the power battery through the DC/DC conversion unit;
the AC/DC conversion unit is used for converting alternating current output by the power grid into direct current capable of meeting the charging requirements of the energy storage battery and the variable unit under the condition that the power grid respectively charges the energy storage battery and the variable unit;
the DC/DC conversion unit is used for converting the output direct current of the energy storage battery or the variable unit into the direct current capable of meeting the charging requirement of the power battery under the condition that the energy storage battery or the variable unit charges the power battery;
the variable unit can be loaded into a battery pack of the energy storage battery or a battery pack of the power battery to charge the corresponding batteries at different time intervals;
and under the condition that the energy storage battery does not meet the preset condition, the power battery and the variable unit are respectively charged by the power grid through the AC/DC conversion unit by controlling the switch unit.
Preferably, the control unit is further connected to each of the AC/DC conversion unit and the DC/DC conversion unit, and is configured to control the AC/DC conversion unit to operate and control the DC/DC conversion unit to not operate when the power grid charges the energy storage battery and the variable unit, respectively, and control the AC/DC conversion unit to not operate and control the DC/DC conversion unit to operate when the energy storage battery or the variable unit charges the power battery.
Preferably, the switch unit includes a first switch group, a second switch group, a third switch group and a fourth switch group, a first end of the first switch group is connected to the output end of the AC/DC conversion unit, a second end of the first switch group is connected to the first end of the second switch group, the input end of the DC/DC conversion unit and the first end of the fourth switch group, respectively, a second end of the second switch group is connected to the energy storage battery, a first end of the third switch group is connected to the output end of the AC/DC conversion unit, a second end of the third switch group is connected to the variable unit, and a second end of the fourth switch group is connected to the power battery.
Preferably, the number of the energy storage batteries is multiple, and the AC/DC conversion unit, the first switch group, the second switch group, the third switch group, and the variable unit are multiple and are connected to the energy storage batteries in a one-to-one correspondence manner;
the control unit is further used for controlling the switch unit to enable the power grid to be charged with the at least two energy storage batteries and the at least two variable units through the corresponding AC/DC conversion unit under the condition of a valley power time period, controlling one variable unit of the switch unit to charge the power battery through the DC/DC conversion unit under the condition of a non-valley power time period, and controlling the corresponding energy storage battery to charge the power battery through the DC/DC conversion unit after delaying for a preset time.
Preferably, the energy storage battery includes a plurality of groups of battery packs, the second switch group includes a plurality of switches corresponding to the battery packs one by one, the second ends of the switches are connected to the battery packs respectively, and the first ends of the switches are connected to the second ends of the first switch group and the DC/DC conversion unit after being connected to each other;
the control unit is further used for controlling one switch in the second switch group to be closed under the condition that the power grid charges the energy storage battery and the energy storage battery charges the power battery; and the power battery charging control circuit is also used for selecting a target battery pack in the energy storage battery which is most matched with the power battery according to preset parameters under the condition that the energy storage battery charges the power battery, and controlling the target battery pack in the energy storage battery to charge the power battery through the corresponding first switch group.
Preferably, under the condition that the number of the energy storage batteries is multiple, the switch unit further comprises a fifth switch group, the number of the fifth switch group is multiple and is in one-to-one correspondence with the energy storage batteries, a first end of the fifth switch group is connected with a second end of the corresponding first switch group and a first end of the corresponding second switch group respectively, and a second end of the fifth switch group is connected with a first end of the fourth switch group and an input end of the DC/DC conversion unit respectively.
Preferably, the preset parameter is any combination of the voltage of the energy storage battery, the voltage of the power battery, the discharge current of the energy storage battery and the battery capacity of the energy storage battery.
Preferably, the preset condition is that the energy storage battery works normally or the electric quantity of the energy storage battery meets the required electric quantity of the power battery.
Preferably, each switch in the second switch group is a controllable switch which is conducted in two directions.
Preferably, the charging requirement of the energy storage battery and/or the power battery is output voltage and current according to charging parameters required by the BMS.
The charging and battery-replacing system comprises an AC/DC conversion unit connected with a power grid, a switch unit connected with the AC/DC conversion unit, an energy storage battery connected with the switch unit, a variable unit, a DC/DC conversion unit and a control unit. The variable unit can be filled with a battery pack of an energy storage battery or a battery pack of a power battery to charge corresponding batteries at different time intervals, the control unit is used for controlling the power grid to charge the energy storage battery and the variable unit respectively through the switch unit under the condition of an off-peak electricity time period, controlling the variable unit to charge the power battery through the switch unit under the condition of a non-off-peak electricity time period, and controlling the energy storage battery to charge the power battery after a preset time length. The variable unit can be used as an energy storage battery to charge and discharge, and also can be used as a power battery to charge, so that when the variable unit is used as the energy storage battery, the storage efficiency of the battery charging and replacing system in the process of storing electric quantity is improved, the cost of the battery charging and replacing system is reduced, and meanwhile, the variable unit improves the flexibility of the battery charging and replacing system. In addition, the control unit can control the energy storage battery to charge in the valley power time period and supply power to the power battery through the energy storage battery in the off-valley power time period, so that the charging and replacing system can store the voltage of a power grid into the energy storage battery in the valley power time period and supply power through the energy storage battery in the off-valley power time period, and the power consumption cost of the charging and replacing system is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application, the drawings needed for the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a circuit diagram of a first charging and replacing system according to an embodiment of the present disclosure;
fig. 2 is a circuit diagram of a DC/DC conversion unit according to an embodiment of the present disclosure;
fig. 3 is a circuit diagram of a second charging and swapping system according to an embodiment of the present disclosure;
fig. 4 is a circuit diagram of a third charging and replacing system according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without any creative effort belong to the protection scope of the present application.
The core of the application is to provide a charging and battery replacing system for reducing the power consumption cost.
In order that those skilled in the art will better understand the disclosure, the following detailed description will be given with reference to the accompanying drawings.
Fig. 1 is a circuit diagram of a first charging and replacing system according to an embodiment of the present application. As shown in fig. 1, the system includes: the system comprises an AC/DC conversion unit 10 connected with a power grid, a switch unit 11 connected with the AC/DC conversion unit 10, an energy storage battery 13 connected with the switch unit 11, a variable unit 14, a DC/DC conversion unit 12 and a control unit 16.
And the control unit 16 is used for enabling the power grid to respectively charge the energy storage battery 13 and the variable unit 14 through the AC/DC conversion unit 10 by controlling the switch unit 11 in the case of a valley power time period, enabling the variable unit 14 to charge the power battery 15 through the DC/DC conversion unit 12 by controlling the switch unit 11 in the case of a non-valley power time period, and enabling the energy storage battery 13 to charge the power battery 15 through the DC/DC conversion unit 12 after delaying for a preset time period.
And the AC/DC conversion unit 10 is used for converting the output alternating current of the power grid into direct current capable of meeting the charging requirements of the energy storage battery 13 and the variable unit 14 under the condition that the power grid is respectively charged with the energy storage battery 13 and the variable unit 14.
And the DC/DC conversion unit 12 is used for converting the output direct current of the energy storage battery 13 or the variable unit 14 into direct current capable of meeting the charging requirement of the power battery 15 under the condition that the energy storage battery 13 or the variable unit 14 charges the power battery 15.
The variable unit 14 can be loaded with a battery pack of an energy storage battery or a battery pack of a power battery to complete charging of the corresponding batteries at different time intervals.
In the embodiment of the application, the valley power time period is a municipal specified valley power time period, and the non-valley power time period is a municipal specified non-valley power time period. It will be appreciated that the off-valley and off-valley periods may vary as municipality regulations change.
In addition, the preset time period in the embodiment of the present application is specifically the time between the start of discharging and the end of discharging of the variable unit 14, that is, the control unit 16 controls the variable unit 14 to discharge to the power battery 15 through the switch unit 11 in the off-peak power time period, and controls the energy storage battery 13 to discharge to the power battery 15 through the switch unit 11 after the variable unit 14 finishes discharging.
It should be noted that, in the battery replacement station, the power battery 15 is a battery replacement battery for quickly replacing the electric vehicle; in the charging station, the power battery 15 refers to a battery in an electric vehicle. In addition, the energy storage battery 13 may be a completely new battery purchased separately, or may be a power battery 15 for the decommissioning of the electric vehicle.
In the specific implementation, the AC/DC conversion unit 10 converts the input signal of the power grid into the input signal of the energy storage battery 13 and/or the variable unit 14 and/or the power battery 15 according to the charging curve with time as a variable.
In a specific implementation, the AC/DC conversion unit 10 is configured to convert an input signal of a power grid into an input signal of the energy storage Battery 13 and/or the power Battery 15 meeting a requirement of a Battery Management System (BMS).
In order to prevent the AC/DC conversion unit 10 and the DC/DC conversion unit 12 from continuously operating and causing unnecessary consumption of the input voltage of the power grid, and to prevent the power grid from supplying power to the power battery 15 when the energy storage battery 13 supplies power to the power battery 15, in a specific implementation, the control unit 16 may be further connected to the AC/DC conversion unit 10 and the DC/DC conversion unit 12, and configured to control the AC/DC conversion unit 10 to operate and the DC/DC conversion unit 12 to not operate when the power grid is connected to the energy storage battery 13 and the variable unit 14, respectively, and to control the AC/DC conversion unit 10 to not operate and the DC/DC conversion unit 12 to operate when the energy storage battery 13 or the variable unit 14 is connected to the power battery 15.
As shown in fig. 1, the switching unit 11 includes a first switch group 20, a second switch group 21, a third switch group 22, and a fourth switch group 23. A first end of the first switch group 20 is connected with an output end of the AC/DC conversion unit 10, a second end of the first switch group 20 is connected with a first end of the second switch group 21, an input end of the DC/DC conversion unit 12, and a first end of the fourth switch group 23, respectively, a second end of the second switch group 21 is connected with the energy storage battery 13, a first end of the third switch group 22 is connected with an output end of the AC/DC conversion unit 10, a second end of the third switch group 22 is connected with the variable unit 14, and a second end of the fourth switch group 23 is connected with the power battery 15.
In a specific implementation, the control unit 16 is configured to control the AC/DC conversion unit 10 to start operating, the first switch group 20, the second switch group 21, and the third switch group 22 to be closed, and the fourth switch group 23 to be opened in the case of the valley power period, so as to ensure that the energy storage battery 13 and the variable unit 14 are charged by the power grid, and control the AC/DC conversion unit 10 to stop operating, the first switch group 20 and the third switch group 22 to be closed, the second switch group 21 and the fourth switch group 23 to be opened, and control the first switch group 20, the third switch group 22, and the fourth switch group 23 to be opened, and control the second switch group 21 to be closed after delaying for a preset time period, so as to ensure that the power battery 15 is discharged by the variable unit 14 first, and the power battery 15 is discharged by the energy storage battery 13 after the variable unit 14 is discharged.
It should be noted that, in order to ensure that the second switch group 21 can communicate both the AC/DC conversion unit 10 and the energy storage battery 13, and communicate the energy storage battery 13 and the DC/DC conversion unit 12, as a preferred embodiment, the switches in the second switch group 21 are all controllable switches that are bidirectionally conductive.
It is understood that the switches included in the first switch group 20, the third switch group 22 and the fourth switch group 23 may be controllable switches conducting in both directions, or controllable switches conducting in one direction.
Fig. 2 is a circuit diagram of a DC/DC conversion unit according to an embodiment of the present disclosure. As shown in fig. 2, the DC/DC conversion unit 12 includes a first inductor L1, a second inductor L2, a switch K1, a switch K2, a capacitor C, and a diode D1. The first end of the first inductor L1 is connected to the first end of the fourth switch group 23, the second end of the first inductor L1 is connected to the first end of the switch K1 and the first end of the switch K2, the second end of the switch K1 is grounded, the second end of the switch K2 is connected to the first end of the second inductor L2 and the cathode of the diode D1, the anode of the diode D1 is grounded, the second end of the second inductor L2 is connected to the power battery 15, the first end of the inductor C and the second end of the fourth switch group 23, and the second end of the inductor C is grounded. In addition, in practical implementation, the control unit 16 may be further connected to third terminals of the switches K1 and K2 to control opening and closing of the switches K1 and K2.
It should be noted that fig. 2 is a circuit diagram of a DC/DC conversion unit 12 provided on the basis of a buck-boost circuit, and the DC/DC conversion unit 12 may also be a separate boost circuit or a separate buck circuit.
The charging and battery-replacing system provided by the embodiment of the application comprises an AC/DC conversion unit connected with a power grid, a switch unit connected with the AC/DC conversion unit, an energy storage battery connected with the switch unit, a variable unit, a DC/DC conversion unit and a control unit. The variable unit can be filled with a battery pack of an energy storage battery or a battery pack of a power battery to charge corresponding batteries at different time intervals, the control unit is used for controlling the power grid to respectively charge the energy storage battery and the variable unit through the switch unit under the condition of valley electricity time periods, the variable unit is used for charging the power battery through controlling the switch unit under the condition of non-valley electricity time periods, and the energy storage battery is controlled to charge the power battery after preset time duration. The variable unit can be used as an energy storage battery to charge and discharge, and also can be used as a power battery to charge, so that when the variable unit is used as the energy storage battery, the storage efficiency of the battery charging and replacing system in the process of storing electric quantity is improved, the cost of the battery charging and replacing system is reduced, and meanwhile, the variable unit improves the flexibility of the battery charging and replacing system. In addition, the control unit can control the energy storage battery to charge in the valley power time period and supply power to the power battery through the energy storage battery in the off-valley power time period, so that the charging and replacing system can store the voltage of a power grid into the energy storage battery in the valley power time period and supply power through the energy storage battery in the off-valley power time period, and the power consumption cost of the charging and replacing system is reduced. In addition, because the variable unit is charged in the valley power time period, the variable unit is equivalent to an energy storage battery in the valley power time period, and therefore the storage efficiency of the charging and replacing system in the process of storing the electric quantity is improved.
On the basis of the above embodiment, the control unit 16 is further configured to control the switch unit 11 to enable the power grid to charge the power battery 15 and the variable unit 14 through the AC/DC conversion unit 10, respectively, if the energy storage battery 13 does not satisfy the preset condition.
The preset condition is specifically that the energy storage battery 13 works normally or the electric quantity of the energy storage battery 13 meets the required electric quantity of the power battery 15.
It can be understood that, when the electric quantity of the energy storage battery 13 cannot meet the requirement of charging the power battery 15, or the energy storage battery 13 works abnormally, the control unit 16 may also control the switch unit 11 to enable the power grid to charge the power battery 15 through the AC/DC conversion unit 10, so as to ensure that the power battery 15 can be charged normally.
Fig. 3 is a circuit diagram of a second charging and replacing system according to an embodiment of the present application. As shown in fig. 3, in addition to the above embodiment, the number of the energy storage batteries 13 is plural, and the AC/DC conversion unit 10, the first switch group 20, the second switch group 21, the third switch group 22 and the variable unit 14 are plural and are connected to the energy storage batteries 13 in a one-to-one correspondence manner.
The control unit 16 is further configured to, in a valley power time period, control the power grid to charge the at least two energy storage batteries 13 and the at least two variable units 14 through the corresponding AC/DC conversion units 10 by using the switch unit 11, and in a non-valley power time period, control one variable unit 14 to charge the power battery 15 through the DC/DC conversion unit 12 by using the switch unit 11, and after delaying for a preset time period, control the corresponding energy storage battery 13 to charge the power battery 15 through the DC/DC conversion unit 12.
In the embodiment of the present application, the preset time duration is specifically the time between the start of discharging and the completion of discharging of the variable unit 14, that is, under the condition that the control unit 16 is in the off-peak power time period, the switch unit 11 controls one variable unit 14 to discharge to the power battery 15, and after the discharge of the variable unit 14 is completed, the switch unit 11 controls the corresponding energy storage battery 13 to discharge to the power battery 15.
In order to improve the working efficiency of the charging and replacing system, as a preferred embodiment, the control unit 16 is further configured to select, according to preset parameters, a target battery pack in the energy storage battery 13 that is most matched with the power battery 15 when the energy storage battery 13 charges the power battery 15, and control the target battery pack in the energy storage battery 13 to charge the power battery 15 through a switch in the switch unit 11 that corresponds to the target battery pack in the energy storage battery 13.
It should be noted that the preset parameter is one or more of the voltage of the energy storage battery 13, the voltage of the power battery 15, the discharge current of the energy storage battery 13, and the battery capacity of the energy storage battery 13.
As shown in fig. 3, on the basis of the above embodiment, the energy storage battery 13 includes a plurality of battery packs, the plurality of switches in the second switch group 21 correspond to the battery packs one by one, the second ends of the switches are respectively connected to the battery packs, and the first ends of the switches are connected to the second end of the first switch group 20 and the DC/DC conversion unit 12 after being connected to each other.
And the control unit 16 is further configured to control one switch in the second switch group 21 to be closed and the other switches to be in an open state under the condition that the power grid is connected with the energy storage battery 13 and the energy storage battery 13 is connected with the power battery 15.
The control unit 16 may control the switching sequence of the switches in the second switch group 21 according to a preset rule, for example, control the corresponding switches to be turned on or turned off according to the sequence of the battery packs in the energy storage battery 13, that is, first control the switch corresponding to the battery pack with the number 1 to be turned on and the other switches to be turned off, then control the switch corresponding to the battery pack with the number 2 to be turned on and the other switches to be turned off, and so on.
It can be understood that, under the condition that the energy storage battery comprises a plurality of battery packs, the control unit only controls the switch corresponding to one battery pack in the energy storage battery to be closed at the same time, so that the battery packs in the same energy storage battery can be prevented from being directly connected in parallel to cause the generation of current circulation, and the service life of the energy storage battery is prolonged.
In order to further improve the working efficiency of the charging and replacing system, in the process of charging the power battery 15 by the energy storage battery 13, the control unit 16 is further configured to select a target battery pack in the energy storage battery 13 that is most matched with the power battery 15 according to preset parameters again when the target energy storage battery 13 does not meet preset requirements.
It can be understood that, in the process of charging the power battery 15 by the energy storage battery 13, whether the electric quantity of the battery pack in the target energy storage battery 13 meets the preset requirement is monitored according to the preset period or in real time, once the electric quantity of the battery pack in the target energy storage battery 13 does not meet the preset requirement, the battery pack in the energy storage battery 13 most matched with the power battery 15 can be reselected, and in specific implementation, the preset requirement may be that the discharge time of the target battery pack in the energy storage battery 13 does not reach the preset time, or that the voltage of the target battery pack in the energy storage battery 13 is not lower than the preset voltage.
As shown in fig. 3, when the number of the energy storage batteries 13 is multiple, the control unit 16 further includes a fifth switch group 24, the number of the fifth switch group 24 is multiple, and the fifth switch group 24 corresponds to the energy storage batteries 13 one by one, a first end of the fifth switch group 24 is connected to a second end of the corresponding first switch group 20 and a first end of the corresponding second switch group 21, respectively, and a second end of the fifth switch group 24 is connected to a first end of the fourth switch group 23 and an input end of the DC/DC conversion unit 12, respectively.
In a specific implementation, the fifth switch group 24 may be a diode, or may be a controllable switch conducting in two directions or a controllable switch conducting in one direction. When the fifth switch group 24 is a diode, the anode of the diode is connected to the corresponding AC/DC conversion unit, and the cathode of the diode is connected to the first terminal of the fourth switch group 23 and the input terminal of the DC/DC conversion unit 12, respectively.
In addition, in the case that there are a plurality of energy storage batteries 13, AC/DC conversion units 10, first switch groups 20, second switch groups 21, third switch groups 22 and variable units 14, when the power grid charges the power battery 15 through the AC/DC conversion unit 10, the control unit 16 may control each AC/DC conversion unit 10 to operate in segments, that is, at the same time, to control one AC/DC conversion unit 10 to operate, and after the operating time of the AC/DC conversion unit 10 reaches a preset time period, select one from the remaining AC/DC conversion units 10 to operate, and the control unit 16 may further control at least two AC/DC conversion units 10 to operate simultaneously, and the output current of the operating AC/DC conversion unit 10 comprehensively meets the charging requirement of the power battery 15.
The charging and replacing system provided by the embodiment of the application has the advantages that the number of the energy storage batteries is multiple, so that the fact that when one energy storage battery works abnormally, the rest energy storage batteries can continue to be charged and discharged is guaranteed, and the stability of the charging and replacing system is improved.
Fig. 4 is a circuit diagram of a third charging and replacing system according to an embodiment of the present application. As shown in fig. 4, on the basis of the above embodiment, the number of the power batteries 15 is n (where n is a positive integer), wherein the number of the DC/DC conversion units 12 matches the number of the power batteries 15, the second ends of the switches in the fourth switch group 23 are respectively connected to the power batteries 15, the first ends of the switches in the fourth switch group 23 are connected to the AC/DC conversion unit 10 after being connected to each other, and the DC/DC conversion units 12 are connected in parallel to the switches in the fourth switch group 23.
In the embodiment of the present application, when the energy storage battery 13 or the variable unit 14 charges the power battery 15 through the DC/DC conversion unit 12, the control unit 16 may simultaneously control the plurality of fourth switch groups 23 to be closed, so as to simultaneously charge the plurality of power batteries 15; when the power grid charges the power batteries 15 through the AC/DC conversion unit 10, only one power battery 15 is charged in the same time period, that is, the control unit 16 controls only one fourth switch group 23 to be closed in the same time period.
It can be understood that, because the energy storage battery 13 can charge the plurality of power batteries 15 at the same time, the charging efficiency of the power batteries 15 can be increased, and the speed of supplying power to the plurality of power batteries 15 by the energy storage battery 13 is increased.
The above provides a detailed description of a charging and battery replacing system provided by the present application. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
It is further noted that, in the present specification, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Claims (10)

1. A charging and battery replacing system, comprising: the system comprises an AC/DC conversion unit connected with a power grid, a switch unit connected with the AC/DC conversion unit, an energy storage battery connected with the switch unit, a variable unit, a DC/DC conversion unit and a control unit;
the control unit is used for controlling the switch unit to enable a power grid to respectively charge the variable unit and the energy storage battery through the AC/DC conversion unit under the condition of a valley power time period, controlling the switch unit to enable the variable unit to charge the power battery through the DC/DC conversion unit under the condition of a non-valley power time period, delaying for a preset time, and controlling the energy storage battery to charge the power battery through the DC/DC conversion unit;
the AC/DC conversion unit is used for converting alternating current output by the power grid into direct current capable of meeting the charging requirements of the energy storage battery and the variable unit under the condition that the power grid respectively charges the energy storage battery and the variable unit;
the DC/DC conversion unit is used for converting the output direct current of the energy storage battery or the variable unit into the direct current capable of meeting the charging requirement of the power battery under the condition that the energy storage battery or the variable unit charges the power battery;
the variable unit can be loaded into a battery pack of the energy storage battery or a battery pack of the power battery to charge the corresponding batteries at different time intervals;
and under the condition that the energy storage battery does not meet the preset condition, the power battery and the variable unit are respectively charged by the power grid through the AC/DC conversion unit by controlling the switch unit.
2. The charging and replacing system as claimed in claim 1, wherein the control unit is further connected to each of the AC/DC conversion unit and the DC/DC conversion unit, and configured to control the AC/DC conversion unit to operate and the DC/DC conversion unit to not operate when the energy storage battery and the variable unit are charged by the power grid, respectively, and control the AC/DC conversion unit to not operate and the DC/DC conversion unit to operate when the energy storage battery or the variable unit is charged by the power battery.
3. The battery charging and replacing system according to claim 1, wherein the switch unit comprises a first switch group, a second switch group, a third switch group and a fourth switch group, a first end of the first switch group is connected to the output end of the AC/DC conversion unit, a second end of the first switch group is connected to the first end of the second switch group, the input end of the DC/DC conversion unit and the first end of the fourth switch group, respectively, a second end of the second switch group is connected to the energy storage battery, a first end of the third switch group is connected to the output end of the AC/DC conversion unit, a second end of the third switch group is connected to the variable unit, and a second end of the fourth switch group is connected to the power battery.
4. The battery charging and replacing system according to claim 3, wherein the number of the energy storage batteries is plural, and the AC/DC conversion unit, the first switch group, the second switch group, the third switch group and the variable unit are plural and are connected with the energy storage batteries in a one-to-one correspondence manner;
the control unit is further used for controlling the switch unit to enable the power grid to be charged with the at least two energy storage batteries and the at least two variable units through the corresponding AC/DC conversion unit under the condition of a valley power time period, controlling one variable unit of the switch unit to charge the power battery through the DC/DC conversion unit under the condition of a non-valley power time period, and controlling the corresponding energy storage battery to charge the power battery through the DC/DC conversion unit after delaying for a preset time.
5. The battery charging and replacing system according to claim 3, wherein the energy storage battery comprises a plurality of groups of battery packs, the plurality of switches in the second switch group correspond to the battery packs one by one, the second ends of the switches are respectively connected to the battery packs correspondingly, and the first ends of the switches are connected to the second ends of the first switch group and the DC/DC conversion unit after being connected to each other;
the control unit is further used for controlling one switch in the second switch group to be closed under the condition that the power grid charges the energy storage battery and the energy storage battery charges the power battery; and the power battery charging control circuit is also used for selecting a target battery pack in the energy storage battery which is most matched with the power battery according to preset parameters under the condition that the energy storage battery charges the power battery, and controlling the target battery pack in the energy storage battery to charge the power battery through the corresponding first switch group.
6. The battery charging and replacing system according to claim 3, wherein when the number of the energy storage batteries is multiple, the switch unit further includes a fifth switch group, the number of the fifth switch group is multiple and corresponds to the energy storage batteries one by one, a first end of the fifth switch group is connected to a second end of the corresponding first switch group and a first end of the corresponding second switch group, and a second end of the fifth switch group is connected to a first end of the fourth switch group and an input end of the DC/DC conversion unit.
7. The charging and replacing system as claimed in claim 5, wherein the preset parameter is any combination of the voltage of the energy storage battery, the voltage of the power battery, the discharge current of the energy storage battery, and the battery capacity of the energy storage battery.
8. The battery charging and replacing system as claimed in claim 2, wherein the preset condition is that the energy storage battery works normally or the electric quantity of the energy storage battery meets the required electric quantity of the power battery.
9. The charging and replacing system as claimed in any one of claims 3 to 6, wherein each switch in the second switch group is a controllable switch conducting in two directions.
10. The charging and replacing system as claimed in claim 1, wherein the charging requirements of the energy storage battery and/or the power battery are output voltage and current according to the charging parameters required by the BMS.
CN202110418730.3A 2021-04-19 2021-04-19 Charging and battery replacing system Pending CN113119770A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114179643A (en) * 2021-10-29 2022-03-15 深圳市科华恒盛科技有限公司 Bidirectional charging pile
WO2023039908A1 (en) * 2021-09-18 2023-03-23 宁德时代新能源科技股份有限公司 Power battery charging method, charging apparatus, and charging system
CN116137940A (en) * 2021-09-18 2023-05-19 宁德时代新能源科技股份有限公司 Charging method, charging device and charging system of power battery

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2023039908A1 (en) * 2021-09-18 2023-03-23 宁德时代新能源科技股份有限公司 Power battery charging method, charging apparatus, and charging system
CN116137940A (en) * 2021-09-18 2023-05-19 宁德时代新能源科技股份有限公司 Charging method, charging device and charging system of power battery
CN116137940B (en) * 2021-09-18 2024-02-20 宁德时代新能源科技股份有限公司 Charging method, charging device and charging system of power battery
CN114179643A (en) * 2021-10-29 2022-03-15 深圳市科华恒盛科技有限公司 Bidirectional charging pile
CN114179643B (en) * 2021-10-29 2024-02-09 深圳市科华恒盛科技有限公司 Bidirectional charging pile

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